I can't see the problem myself - set of wrap around cameras + radio, linked via a secure internet connection, and as said why not have half a dozen sleepy airports overnight run by a single controller somewhere like Swanwick.
Important, of course that everybody knows that is the case - one possible fix is that the controller uses a callsign along the lines of "Farnborough Relay", and that the service is only A/G.
But, if it opened up a lot of runways currently not useable out of hours in the UK, maybe for a small charge, I'd be very in favour.
G